#1 Cris Cyborg

Alright, granted that Cris Cyborg -- akin to Jon Jones -- has tested positive for illegal PEDs (Performance Enhancing Drugs) in the past, however, Cyborg is simply too dominant a force to be left off the list. The terrifying UFC Women's Featherweight Champion possesses great cardio, unquestionable strength as well as legitimate one-punch KO power.
Cyborg often notes that her love for training not only the skills that are required to perform as a world-class fighter, but also the strength and conditioning routines; is what makes her such a well-rounded combatant. Cyborg, much like TJ Dillashaw, doesn't simply coast on her diverse skill-set, but instead trains on a consistent basis and never shies away from putting in that extra work.
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Furthermore, Cyborg's energy management issues -- something that she experienced early in her MMA career -- now seem to have been phased out expertly. Irrespective of whether or not you condone her past steroid usage, the fact remains that Cyborg is indeed one of the fittest fighters in the UFC today.
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